Power-hammer.



n PATENTBD lMAY 23, 1905.

LMn

LMA

NAB

.BRM

WUNESSES; y

A TTOHNE Y UNITED STATES Patented May 23, 1905.,

PATENT OFFICE.

GEORGE BIGNELL' OF DENVER, COLORADO, ASSIGNOR TO THE GEO. BIG- NELL POVER HAMMER AND GENERAL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

POWER-HAMMER.

SPECIFICATION formingpart of Letters PatentNo. 790,553, dated May 23, 1905.

y Application filed April 27, 1904. Serial No. 205,241.

T cti/Z whom, t may concern:l p

Be it known that I, GEORGE BIGNELL, a citizen of the United States, residing at Denver, inthe county of Denver and State of Colorado, have invented certain new and useful Improvements in Power-Hammers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The production of a power-hammer of light, cheap, and durableconstruction and having novel features of construction is the object of my improvements, and the claims appended hereto will set out the particulars of these improvements.

In the accompanyingdrawings, Figure 1 is a front elevation. Fig. 2 is a side elevation, a portion being shown in central vertical section. Fig. 3 is av horizontal section upon line a b of Fig. 1. Fig. 4-shows the'rear-shaft bearing and brake. Fig. 5 shows the frontshaft bearing and crank-disk guide. Fig. is a vertical section on the line c d of Fig. 2, showing the clutch-shifting lever.

The standard 1 of the machine is a squared wooden post, which may be easily procured at the place where the machine is to be erected and used,'thus doing away with thel usual heavy standardand greatly reducing the cost of transportation. The anvil-block 2 is secured to the front of the post by the bolt 3, which penetrates both anvil and standard and the brace 4, and both the stand# ard and the anvil mounted upon the same base-beam. A block 5 separates the anvil from the standard. The hammer or head 6 is suspended above the anvil from the crankdisk 7 on the end of the shaft 8, which penetrates the post and is j ournaled at the front in the bearing-plate 9 and at the rear of the post in the bearing-plate 10. In order to relieve the crank-disk 7 from the jar of the movement of the hammer, a bow-spring 11, attached to the pitman 12 of the crank-disk, is connected to the hammer by means of links 13, ointed together and to the head by a pin 20 has an elongated dovetailed headV 21,

which is' secured to the disk in a dovetailed groove 22. The crank-pin is radially adjustable upon the disk, so as to increase or decrease the stroke of the hammer. The front bearing-plate 9 is circular and has a marginal rim 23, which bears against the rear side of the disk, so-as to brace lthe disk against rocking on its shaft. The rear bearing-plate 10 is also circular and has a `mar ginal flared rim forming a brake 24, as will be presently explained. Motion is transmitted to the shaft from the belt-pulley 25, loose upon the shaft, by Vmeans of a sliding barrelclutch 26, splined upon the shaft by the y key 27.

On that side of the pulley next to the post its inner periphery is beveled from the center toward the edge, and the outer surface of the clutch next the pulley is beveled at the same angle as the bevel on the pulley, so that when the clutch is shifted toward the pulley it will tightly t its peripheral bevel and bind the pulley and clutch together by friction. Thus the motion of the pulley is imparted to the clutch, and the clutch being splined upon the shaft the sh aft is caused to turn. The

, other side of the clutch is beveled at the sam-e angle as the flared rim of the rear bearing 24,

so that when the clutch is shifted toward the S 5 .bearing it will tightly fit within the rim of push-rod 33, pivoted to the other leg of the lever, extends down and is pivoted to the footlever 34, which is pivot'ed to the post at 35. This foot-lever extends around both post and anvil, so as to be within easy reach of the operator at the front. At the rear end the foot-lever extends beyond its connection with the push-rod 33 and is provided at its rear end With a weight 36, adjustable thereon by the set-screw 37.

In the drawings the machine is shown with the clutch shifted to impart motion to the shaft, which position was obtained by pressing down on the front of the foot-lever 34, which pushed the rod 33 up and turned the clutch-shifting lever 3 1 on its bearing, so that its upright leg, which is connected to the clutch by the shoes 29, pushed the clutch toward the pulley. Upon releasing the front of the lever 34 its rear Weight will fall and pull the rod 33 down and cause the clutchshifting lever 3l to move the clutch out of connection with the pulley 25 and into connection with the brake 24, thus arresting the movement of the shaft.

The front and rear bearings 9 and 10 are cast With the bottom part 38 of the bearingsurfaee integral with the plate and with a hole 39 above, into which the top caps 40 are inserted, so that the surfaces of two members of the bearing may be equal on the shaft.

The features which constitute my improvements reside in the means of mounting and securing the anvil and which includes the clamping of the anvil to the standard by the separating abutment-block, the yoke-brace, and the bolt passing through the yoke-brace, the anvil, the abutment-block, and the standard and nutted on the rear side thereof, thereby rendering a Wooden frame a firm and durable support for an anvil mounted directly upon the base-beam 41, on which the standard is mounted, giving the same foundation to both.

The provision for securing the 'knucklejointed links Within an opening directly in the hammer-head and the provision of a power-operated pitman-rod maintaining its alinement with the axis of the coupling-pin in its reciprocating movement is, so far as I know and can find, an advantageous and novel construction in a power-hammer. The provision of a grooved disk having the function of a crank for the pitman-rod of a powerhammer for maintaining an ali nement of said rod with the hammer in operating it and the seating of said crank-disk upon an annular bearing-casting, which also forms the`bearing for the power-driven shaft, is an advantageous and novel construction for operating the hammer and the pitman-rod in alinenient with the hammer, and thereby avoid the lai'- eral strain of the hammer in its guides which a laterally-deflected pitman-rod and its connected bow-spring would produce. lt is important to note that the provision of the eircumferential rim of the bearing-plate E) as a seating for the grooved crank-disk is important as a means of maintaining a true movement of the pitman-rod, and thereby a true and easy movement of the hammer in its guides.

l claim-- l. In a power-hammer, a base beam, a standard mounted thereon, an anvil mounted on said base-beam and having means for securing the anvil to the standard, consisting of an abutment-block separating the anvil from the standard, a yoke-brace secured to the standard, a bolt passing through the yoke-brace the anvil, the ahutment-hloek and the standard and nutted on the rear ol the latter.

2. ln a power-hammer, a base-beam, a standard mounted thereon, an anvil` means for securing it to the standard, a hammerhead having a horizontal opening near its upper end, a pair of knuckle-jointed links, a pin coupling said links within said hammerhead opening, a guide-block for said hammer secured to the standard, a grooved crankdisk, a pitmanrod connecting the bowspring and grooved disk, and a mounting for said grooved disk consisting of a powerdriven shaft, a. disk having a circumferential ring-bearing for the grooved disk and forming a bearing for said shaft.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE BIG N ELI).

Wlitnesses W. C. KING, L. WARD BANNISTER. 

